using (Aes myAes = Aes.Create())
            {

                // Encrypt the string to an array of bytes.
                byte[] encrypted = EncryptStringToBytes_Aes(original,
                                   myAes.Key, myAes.IV);

                // Decrypt the bytes to a string.
                string roundtrip =
                         DecryptStringFromBytes_Aes(encrypted,
                              myAes.Key, myAes.IV);


            }